Muzzle brake



FIG. 1 is a top, front, left perspective view of a muzzle brake showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a top view thereof.

The uneven-length broken lines represent unclaimed boundaries of the claimed design. The even-length broken lines showing the remainder of the muzzle brake are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a muzzle brake, as shown and described. 